Control Method of 28BYJ48 Stepper Motor

　　I got a 28BYJ48 stepper motor not long ago, but I didn't have any information. I searched online and found some information, but I didn't succeed in following the program experiments introduced online. Later, according to the principle part of the information, I tried to write a program myself, and after many experiments and debugging, I finally succeeded.

　　Haha, quite a harvest!!!

　　A stepper motor is an actuator that converts electrical pulses into angular displacement. In simple terms: when the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle (i.e., step angle) in the set direction. We can control the angular displacement by controlling the number of pulses to achieve accurate positioning; at the same time, we can control the speed and acceleration of the motor by controlling the pulse frequency to achieve speed regulation.

　　The 28BYJ48 stepper motor is a four-phase eight-beat motor with a voltage of DC5V~DC12V. When a series of continuous control pulses are applied to the stepper motor in a certain order, it can rotate continuously. Each pulse signal changes the power-on state of one or two phases of the stepper motor winding once, which corresponds to the rotor rotating a certain angle. When the change of the power-on state completes a cycle, the rotor rotates one tooth pitch. The four-phase stepper motor can operate in different power-on modes. Common power-on modes include single (single-phase winding power-on) four-beat (ABCDA...), double (two-phase winding power-on) four-beat (AB-BC-CD-DA-AB...), and four-phase eight-beat (A-AB-B-BC-C-CD-D-DA-A...). This example is implemented using the four-phase eight-beat drive mode.

　　The following is the C language control program I wrote to achieve the effect of the 28BYJ48 stepper motor rotating five circles forward and then five circles reverse:

//************************************************************************************
//*  Title:  Stepper motor forward and reverse demonstration program                                               *
//*  File:  Stepper motor forward and reverse demonstration.C                                                 *
//*  Date:  2011-3-13                                                            *
//*  Environment:  Use the homemade microcontroller minimum system board to test passed                                     *
//************************************************************************************
//*  Description:  28BYJ-48 stepper motor forward and reverse control                                           *
//*  Motor use ports: P1.0, P1.1, P1.2, P1.3                                        *
//*  Single and double eight-beat working mode: A-AB-B-BC-C-CD-D-DA                                       *
//********************************************************************************

#include
#include

//*************************Forward rotation phase sequence table*****************************
unsigned char code FFW[8]={0x08,0x0c,0x04,0x06,0x02,0x03,0x01,0x09};

//**********************Reverse rotation phase sequence table***************************** 

unsigned char code REV[8]={0x09,0x01,0x03,0x02,0x06,0x04,0x0c,0x08};

//***********************Delay subroutine******************************** 

void delay(unsigned int t)
{                           
  unsigned int k;
  while(t--)
  {
    for(k=0; k<125; k++)
    {}
  }
}

 

//*************************Stepper motor forward ******************************** 

void  motor_ffw(unsigned int n)
 {
  unsigned char i;
  unsigned int  j;
  for (j=0; j<8*64*n; j++)
   {
     for (i=0; i<8; i++)
       {
         P1 = FFW[ i];
        delay(1);
        }
   }
 }

 

//*********************Stepper motor reverse ********************************** 

void  motor_rev(unsigned int n)
{
   unsigned char i;
 unsigned int  j;
 for (j=0; j<8*64*n; j++)
     {
       for (i=0; i<8; i++)
       {
         P1 = REV[ i];
         delay(1);
       }
     }
 }

 

//*************************Main program************************************
main()
 {   
  while(1)                     
   { 
      motor_ffw(5);          //The motor rotates 5 times forward
      delay(1000);
      motor_rev(5);          //The motor rotates 5 times reverse
      delay(1000);

   }
 }